Free FomaPan Reciprocity IOS APP

I

ian barber

Admin
Registered
FomaPan-Reciprocity.png

For many years, I have found myself returning to Fomapan black and white films, so I decided to create a simple iOS app specifically for Fomapan users.
There are no unnecessary features or complicated settings. It is simply designed to get the job done.

The app calculates reciprocity corrected exposure times for Fomapan 100, 200 and 400, making long exposure photography much easier without needing to consult charts or work through the calculations manually.

Just choose your film, enter the metered exposure time, and the app gives you the corrected exposure.

It is now available on the Apple App Store.
https://apple.co/4gQtUF9
 
Hello Ian,

thank you very much, that is a wonderful tool to have! It looks like you used the Te=Tm[1.5(logTm)^2+4.5(logTm)+3] formula and twicked the results a little (a few seconds here and there)?

When I started using Foma 200, I created for myself a spreadsheet (attached here) with three columns; one used that formula, the second the 1.43xx factor I found somehwere online and the third an average of the two.

The numbers in your app look very close to the first column in my spreadsheet, I'd be curious whether the small differences are adjustments you made out of direct experience.

As well, I noticed that you used full stops all the way; perhaps, past 1 sec you could add at least thirds of a stop? In my experience, those are pretty useful when using a film with such a strong reciprocity, and are difficult to figure on the fly given the very non-linear nature of Fomapan 200 Creative's response.

Thanks again! Best regards,

Vieri
 

Attachments

  • Reciprocity_Fomapan_200_Creative.pdf
    57.7 KB · Views: 1
You must log in or register to reply here.
Back
Top